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If you've ridden the ISS Flow trail and fancy another lap but with a bit more challenge, this is the line for you.
Most of it follows the ISS Flow route but in the middle section of that line you detour off left and take this more challenging route instead.
The run starts at the very top of the Isskogelbahn cable car and is clearly signposted - it begins at a small wooden bridge immediately south of the lift station.
The first section is pretty straightforward, with a few tight-ish turns and a small wooden roll being the only obstacles.
The second part takes you into the forest, and almost immediately after entering the forest you'll reach a junction where this line goes (and is signposted) left and the main ISS Flow route goes right.
Turn left and get strapped in! The line is not hugely different to the ISS Flow line but it does feature some steep little sections which are trickier than anything on the Flow route.
There are also some optional jumps but these are easily avoided and are all marked in advance with yellow "exclamation mark" signs.
All too soon you'll find yourself at a wooden bridge - turn right to rejoin the ISS Flow trail or turn left for an even bigger challenge...the ISS Vertical route. Ride down ISS Flow briefly to reach a jeep track - cross this and then make a long traverse rightwards to the final technical part of the run.
Like the 2 parts which preceded it, the third and final technical section is fun and challenging without ever being "hard".
Unlike the other 2 sections it passes through some recently forested areas so there are tree stumps everywhere - bear this in mind when judging your speed....a fall would hurt! The trail deposits you on a road - turn right on it and ride past the Rösslalm restaurant to reach the Dorfbahn lift middle station.
Go past this until you're directly under the lift cables, at which point you can choose to either descend a road back to Gerlos or (highly recommended) head down the ISS Shore trail.